Eltas d



(No Model.)

B. D. LIBBEY.

CORRUGATED SHEET METAL CUTTER. No. 363,524. 'Paig ented May 24, 1887.

UNITED STATES PATENT OFFICE.

ELIAS D. LIBBEY, OF ST. PAUL, MINNESOTA, ASSIGNOR TO THE SCRIBNER- LIBBEY COMPANY.

CORRUGATED-SHEET-METAL CtJTTER.

PECIFICATIO N forming part Of Letters Patent No. 363,524, dated May 24, 1857.

Application filed Srptember .28, i856. Serial No. 214,763. (No model.)

To aZZ whom it may concern:

Be it known that I, ELIAS D. LIBBEY, a citizen of the United States, residing at St. Paul, Minnesota, have invented certain new and useful Improvements in Corrugated-Sheet- Metal Cutters, fully described and represented in the following specification and the accompanying drawiugs,forining a part of the same. The object of this invention is to cut sheets of corrugated metal without deforming the shape of the ribs and grooves upon the same; and it consists,partly,in the combination,with two stationary cutters notched to fit the ribs upon the sheet metal, of a movable cuttingblade adapted to fit between said stationary cutters and to shear the sheet metal by its contact with both of said cutters, partly in the construction of the two stationary cutters adjustable to ward one an other, partly in means 2 for applying various cutters to the same bed, and partly in means for bracing the movable cutter-arm.

The construction is provided with a bedplate, upon which the two stationary cutters 2b are secured so that they may be detached and replaced by others with different notches, and the cutter-arm is hinged at one end of such bed and vibrates up and down between the inner edges of the stationary notched cutters when in action, and is lifted above said cut ters when placing the sheet metal thereon. The supporting of the corrugated sheet metal upon two cutters, with a narrow opening be tween them, holds it firmly during the cutting operation and prevents-the bending of the metal, while the action of the shearing-blade upon its opposite edges, in contact at the same time with the opposed stationary cutters, obviates any tendency in the shearing-blade to 0 press away from the stationary cutter, and

thus enables it to cutmoresmoothlyand toretain its edge more durably. A

In the drawings, Figure l is a plan of the bed, the stationary cutters, the crank- 5 shaft. Fig. 2 is a side elevation of the entire machine, with a hand-lever applied to the crankshaft, the lever being broken to shorten its projection upon the drawings. Fig. 3 is a transverse section of the bed and cutters on line as m in Fig. 1; and Fig. 4 is a transverse section of the movable cutter arm on line 2 z in Fig. 2.

a is the bed-plate, which may be secured upon anysuitable table or work-bench, or pro vided with legs, if desired.

b b are the lower cutter-seats, and c c the lower cutters, formed of shear-steel, and so cured thereto by screws (1.

e are pivot-lugs formed at one end of the bed to carry thejoint-bolt e, upon which the outtcr-armf is hinged, and g is the upper cutter or shear-blade, secured to such arm by bolts g. At the opposite end of the bed acrank or toggle-shaft, h, is journaled in' bearings h, and is provided with an arm, 2', which is attached by a link, 7', to the outer end of the cutter-arm. I

The end of the crankshaft is shown squared, wit-h a lever, Ir, fitted thereto, in Fig. 2 for turning the shaft in the direction of thearrow Z, and thus pressing the shear-blade 9 down between the cutters c c. The cutter-arm is shown in Fig. 2 braced with a trussrod, m, secured near the opposite ends of the armfby I bolts in, and provided in the middle with a straining bolt or stud, a, and nut n. 'Thecutters c c are adjusted to fitagainst the opposite sides of the blade 9 by depressing the latter and securing the cutterseats bbupon the bedplate, with the cutters in contact with such blade. \Vhen thus adjusted an oscillating movement of the lever It operates to vibrate the shear-blade up and down, the blade penetrating between the cutters in its lower position and being elevated sufliciently above the same to introduce the sheet metal when raised, as shown in Fig. 2.

To compensate for wear after the cutters have been adjusted, or to prevent the shearing operation from pressing them sidewise o upon the bed, one or both of the cutter-seats may be provided with set-screws 0, inserted through lugs 0 upon the bed-plate and abutting against the edge of the seat, as shown in Figs. 1 and 3. Such screws are shown in the 9 5 drawings applied to the seat I), which is secured upon the bed by screws r, inserted through slots s,and the seatb is shown secured to the bed by bolts 1-.

The slotted seat, and one or more set-screws rco cutters may be removed from the bed and re placed by other seats provided with differently-notched cutters; or the cutters themselves may be changed without displacing the seats, by removing the bolts d, and thus liberating the cutters from the seats.

A pair of cutters adapted to any particular form of corrugated iron may then be secured in the same seats, and the machine .be thus adapted for immediate use in cutting differcntly-corrugated iron.

The stationary cutters are necessarily made long enough toinclude the entire width of the corrugated sheet, and as thelower edges of the shear-blade 9 (shown in Fig. 4 at are made to shear simultaneously against the inner edges of the cuttersc c, the cutting operation severs a narrow strip from the corrugated sheet equal in width to the thickness of the shearing-blade,and an opening, 25, is there fore made through the bed a to permit such severed strips to fall through and be dis charged from the lower cutters.

The cutter-'armf requires very little lateral stiffness, as it is supported on both sides by contact with the lower cutters when in Opera ation, and a rib, f, at right angles with that flange of the arm upon which the blade g is secured, serves effectually to brace it in a lateral direction.

The lateral stiffening of the shear-blade by its operation between two lower cutters, in conjunction with the brace or truss rod m, perunits the arm to be made of great lightness, whatever its length, and thus renders the machine cheaper in construction and more conven'ient to transport.

Having thus set forth the natureand operation of my invention, what I claim is 1. In a corrugated-sheet-metal cutter, the

combination, with two stationary notched cutters, of a movable shearing-blade fitted between the same and adapted to cut by both of its opposite edges in contact with the inner faces of such cutters, substantially as herein set forth. V

2. I11 a corrugated-sheetmetal cutter, the combination, with a bed having a shearingblade hinged at one end thereof and movable up and down, as described, of two notched cutters adjusted to contact with the sides of said blade when depressed and removably attached to the bed, substantially as herein set forth.

3. In a corrugatedsheet-metal cutter,- the combination, with a bed having a shearing blade hinged at one end thereof and movable up and down, as described, of two notched cutters detaehably secured to the bed, and means for adjusting such cutters toward one another, as and for the purpose set forth.

4. In a corrugated-sheetmetal cutter, the combination, with'a bed having a shearingblade hinged at one end thereof and movable up and down, as described, of the seats 7) I), 'detachably secured to the bed, and the notched cutters c 0', attached removabl y to the seats, as and for the purpose set forth.

5. In a corrugated-sheetmetal cutter, the combination, with the bed and two notched cutters,- c c, secured thereon, with space for an intermediate shearing-blade, of the cutter-arm f, hinged at one end of the bed and formed with the lateral rib f and provided with the blade 9, having opposite cuttingedges 9', adapted to operate with the cutters c c, as and for the purpose set forth.

6. In a corrugated sheetmetal cutter, the combination, with the bed and two notched cutters, c c, secured thereon, with space for an intermediate shearing-blade, ofthe cutter-arm f, hinged at one end of the bed and provided with the shearing-blade g, the brace-rod m, attached to the arm at opposite ends, and the stud a, adapted to stay the said rod in the mid dle, as and for the purpose set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

ELIAS LTBBEY.

\Vitnesses:

SAM L. SEWALL, J. A. GREGG. 

